Let x be the quantity of solution one in mixture.
so solution 2 would be (400-x) L
according to ques.
80% of x + 30% of (400-x) = 62% of 400
i.e. 80x/100 + 30(400-x)/100= 62400/100
=> 80x - 30x = 62400 - 30400
=> 50x = 32400
x=256 L
therefore 256L of solution one is required